<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录</title>
    <style>
        div{
            height: 300px;
            width: 300px;
            margin:auto;
        }
    </style>
</head>
<body>
    <div>
        <h2>登录</h2>
        <form action="login" method="post">
            <span>用户名：</span><input type="text" name="username"></br>
            <span>密码：</span><input type="text" name="password"></br>
            <input type="submit" value="提交">
        </form>
    </div>
</body>
</html>